21/6 + 4 2/3= what is he answer to this problem let me know

First change mixed number to improper fractions

Rule a b/c=(ac+b)/c

13/6+14/3

To add or subtract fractions you need a common denominator...

Rule to change denominator without changing the ratio of the fraction...

(a/b)=(a/b)*(c/c)=(ac)/(bc)  multiplying anything by one keeps the original value intact...

13/6+(14/3)(2/2)

13/6+28/6

Rule for adding fractions...(a/b)+(c/b)=(a+c)/b so

41/6

And you can change this back to a mixed number if you wish.

41/6=6 5/6

The third box is a function